Centralized control for grinders



June 5, 1928.

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SA EINSTEIN CEN'FRALIZED CONTROL FOR GRINDERS Filed (301:. 15, 1923 18 Sheets-Sheet 14 INVENTOR BY gv( my (ZIM Wl- ATTORNEY Filed Oct. 15. 1923 Si EINSTEIN CENTRALIZED CONTROL FOR GRINDERS June 5, 1928.

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S. EINSTEIN CENTRALIZED CONTROL FOR GRINDEHS 18 Sheets-Sum4 i,

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S. EINSTEIN CENTRALIZED CONTROL FOR GRINDERS INVENTOR [lm/WM ATTORNEY WITNEssEs x06.' MW

June 5, 1928.

S. EINSTEIN CENTRALIZED CONTROL FOR GRINDERS 18 Sheets-Sheet Filed Oct. 15, 1923 same Width Patented June 5, 1928.

UNITED STA OFFICE.

SOL EINSTEIN, F CINCINNATI, OHIO, ASSIGNOR. BY MESNE ASSIGNMENTS, TO CIN- CINNATI GRINDERS INCORPORATED, OF CINCINNATI, OHIO, A CORPORATION OF OHIO.

CENTRALIZED CONTROL FOR GRINDERS.

Application led October 15, 1923. Serial No,

A grinding-machine (to which this invention relates) when arranged for Iierforining Cylindrical grinding, embodies a grindingwheel and a work-carrier which usually provides two centers for supporting the respective ends of the Work. The one center is mounted in a so-called tail-stoek and the other in a head-stock which provides means for rotating the work constituting the center and also the Work centered thereby. Ileing thus rotated, periphery or any trically with its axis into Contact with grindiiig-ul'ieel. There are commonly tivo classes4 of grinding to he performed by a machine of this de seription; first, grinding a surface ol' the the grinding wheel and sec-- ond` grinding a surface of more extensive length. In the former ease, it is only necessary that the `work shall be shifted transversely to its axis and towards the grinding wheel at a rate commensurate with the grinding capacity of the latter; the in-feeding of the work being arrested as soon as its periphery has been ground to the requisite diam` eter. 1n the second case7 the ivorli is moved to and fro longitudinally to its axis across the periphery of the grinding-wheel andr` with each advance stroke it is insfed a distance compatible with the action of the grindingwlieel and thus any given length ot' work may lie ground to any desired diameter by an intermittent operation against they grind ing-\vlieel.

These elemental motions must be subject to close control so that the rate of iii-feed may be proportionate to the cutting cas pacity of the wheel and likewise the rate ot the longitudinal travel or so-ealleil trav-- erse of the u'lirlccarriei. The direction of movement must likewise he under control and these mmements must lie capable ol' heing performed either Ly power or manually. The aatoiiiatic reversal in the direction of the traverse (which takes plaee at the end of each stroke) must he effected smoothly and ivithout jar so as to keep the machine free from rvibration which would be detrimental to the quality of the finish of the ground surface. llurtherinore. the reversal must be accomplished at each stroke very nearly at t ie same point because frequently it is necessary to grind to a shoulder" and therefore the work-carrier must not travel materially further at one stroke than at another.

These ends are attained by this invention which, furthermore, aims to render available the simplest possible mechanism for that purpose. Heretofore, much mechani- -cal elaboration and complexity has been unavoidable and this is especially true of the control-levers hotli from structural and lunctional standpoins. That is to say, in a structural sense. the eontrohlevers have been numerous and have been arranged on the machine in a very complicated manner. In a functional sense, .these control levers have been very confusing to the user inasmuch as in many respects they are mutually dependent upon one another so that a given movement of one of the levers may produce a certain result in one ease and a different result in another ease according to the position of 'a second leva'.

An important objeet of this invention is so to devise and arrange the ti'aii.--iiiission system that it will he under the control ot comparatively few levers; ach of ivhich` when moved in ay given manner, will ot' course aceomplish the same result and all ot' which will he very conveniently arranged so as to afford a-thoroiighly centralized control of the entire machine whereby the attendant vvitliont materially7 disturbing his position may at once cause the machine to respond to any' wishA It frequently happens. during the operation of a grinding machineJ that the at tendant may desire to arrest all movement of the work. Heretofore, that has necessitated either a complete shutdown of the. machine (including the grinding-wheel) which is undesirable` or else a variety of operations which is also undesirable, portant objective of this invention is to make it possible for the user instantly lo arrest every movement of the machine (with the exception of the grindinglwheel) by merely actuating a single lever which \v`ll forthwith stop the flow of the Coolant and which will simultaneously stop the rotation of the Work. and stop its traverse, and stop its in-feeding. Thereby, the user is afforded an absolute control over the operation of the machine nvithout being obliged to Wait for the grindingwheel to slow down and withfit o' in any Sense disturbing the smooth and outinuous running of the winding-wheel. Likewise. by tho operation ot the sume footlever, he muy start the. entire inuehine in operation without being obliged to wait for the grindingy wheel to Speed up und without heini;r mbjeeted to any other annoyanees or eonditionb detrimental to the quality of the work.

trindiutmniiehines are eusentiully instru- 1nont.- of preris'ion und they must likewiee. produee u very uniform inish on the. work. The slight'iwt free-play will nliinifet it elf in vuriutiom in the finish und it is thereforey important that themarhiue shell be as rigid au powsilile eou;-i tent with it,`v gross weight. An uint of thir-4 invention is no to distribute the gross wtijght ot the muehine. tl'int it will enhunee the generul rigidity of the machine, and to lot'iite und mount the various parts in a manner mo t eomptitible with the elimination of :ill :ivoidiible vibration. Thus this invention proposes, to mount the grindingnvheel iu it iet-'v' uilwtuntiul manner direetly upon the baue of the nur ehino and to load down the workeurrier twhieh mun neeebsarily :thift on the time) by mounting therein or thereon many ot' the trunnuission elements thzit hure heretofore been mounted in the time; therein1 musing' thtl middle to reit` tirmlkv upon its .-;li\lewu v und he therefore treed of vibration. l"urtherniore. it' is propobed to niuke the middle or other shiftrible. port supportin; r the trnnsniipeion ele ments, relatively niaisive und it proiiowul to give the rmiddle trtliiee-li1ie upport i. e.. :it eeth of its entremitie 4 :ind :it it.`4 middle; the hitter beingn in tlirert line with the plune of the grimling-wheel: und espeeiiillvv to lornt'e the feerltfrew for the sudtlle eoint-itlent with the plune et' the .f :rintling-wheel .W thut the direriion ot thru-t ot' the work ugr-mimi, the grindingwvhet-i will not be ollet und will not trnil to Aving the vmldle out of purulleliein V`with ite guidtnvuys.

Another o --i't i\' to enlninre the eine oll nuinipulution otV the grindingynnirliine hv eniploiinf; :t toot treudle whit-h will enuhle the met' to time in\t:intl-\' uvuiliililr lioth ot' hi hund\ for purpow other thun the :ioppug'e of tht` llow otroolzint. und ofthe rotti tion und l'emlin;l of the work; the lutter lieingr :ngeoniplhhed blv hi foot. 'hen :t large 'numbeivot' toinptnutivelv mull pieee 4 :ire to he ground. tht` fuvinj; of :in v ot the time involved. in replruintrv u tiniehed pieve b v the next blunk. heeome venty important. If the user hnf` to stop the machine bv opercitin);v a hu uhhver. that hund is unuvuiluhle for other diuiw4 when time i ueeordingly lo t. In the pre-em invention. hoth hunds uro :it :,ill timer :ivtiilzilile to the operator for enlihrzit in nel reni-iv omv the work und restoring tlry initrd uiting the miieh'ino und insert` ing.: ilu u1-v hhuik; the tui-ting und Stor ping* operation being performed by the foot und `freeingr the hund from that work. This. in the uggfretute. etl`ert u very material suving when u .nieression ot' iuntill pieew4 ure to be ground.

Another strurtnrul improvement renides in employing two tlnplieute et ot" ehungegears in tht` muehine; the ohjeet being; to redut'e the t-ot of iuunulzn'ture :intl zilfo to simplify und fuvilitzite the replzieemeut of hroken or duniztged geur For exulniple. in ny fnetory employing u number ot' grindingL muehine where it is e entiul to have on hund pure eeuw lor purpo e ol' immediate replacement. the u-er i not required to keep eo inuny spure purt lieenme tht` tuo ets of eliziiig'efgeiir,` :ire ulwolutelv inrhunpjeulile. und thi` pure purt uituble tor the. one in' therefore equally l@uit-Lillie for the other: :ill of whieh materially promote l the eontinuetl muintenanee in operution of the inrit-hin@` hy the user. v

Another ohjeet is .so to improve the iii-feed meehunism that, when it heroines.neeeseury to withdraw the work :it the eonelusit'n'i of the grinding operation. u l@imple ,drift of the. iii-feed nieehunisin will sininltuneouslv di eonneet it from the power und Jforthwith throw in :i rapid nuinuul movement ao that" the work muy be withdrawn rapidly Without :inv interferenee from the power meehtinism.

A\nother ohjeet iu to simplify the mounting ot the level t'or changing! t'ho geur# controlling;l re\peetivel|v the truvewe oti the work rurrier und the rotution of the, work; the e levery eut-h bein; tiltnhley towurth` u @han ueter en :t ehitrt-plute representing; the speed ohtuinuhle when the lever is tilted, towards thut purtieuhir tigure und to euuble the bpeed to be progrwsively inerezuel h); simply lShifting the lever when tilted to the one Side or to the other dependiimr upon whether zi higher wries or u lower series, of speed-rotzition i Hinght for.

Another ohlieet i5 o to iniprovethe niierometer :nljurdmeut for the infl'eed thut the user `will lie freed troni :i souree ot eonftr iou exhihitwlhv exi-ting imiehinm4 whieh provide :i dog movulile :itfziiit n stop to limit the iu-t'eed. lnitiaillv thut do.;r is set :it the point proper ior the then-'existing diunieter o]l the grintlilruY-vv heel hut the lutter grmluull'v weur` und heut-e the position of the do;r inu t he :ilteretl to eoinpensitte for thut weur. A\`o\v. the e muehines provide meenl for releasing' the do; und ai mierorum eter tleviee tor shifting it :ieeurutiely The u er u.--e; rt;iin-. hv meusurenient. from time to time. how nur'h zullimtiuent -hould he (Jtiven the dog und it not iul'retpientlv huppeiml tluit he lieeonie` eontuged in his` eount` und dot` not know the preeise piwition the do: Should oeeupv; in whieh eroe he is out to niueh trouble to 1get the mutter ;-.tr:.ii;1htentul out. Bv thin invention. however7 provision l (if) 

